NEW: Florida pizza delivery worker stabs a pregnant customer 14 times because she was upset about a $2 tip Brianna Alvelo, 22, was upset over a $2 tip after delivering a pizza to the Riviera Motel in Kissimmee and returned with an accomplice The victim was celebrating a birthday with her boyfriend and 5-year-old daughter She gave Alvelo $50 for a $33 order but only tipped $2 because Alvelo did not have change According to police, the victim shielded her daughter during the attack and was struck in the back by the suspects Alvelo faces charges of attempted murd-r, home invasion with a firearm, assault, and kidnapping